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- Title
Chordacentrum mineralization is delayed in zebrafish betaglycan‐null mutants.
- Authors
Molina‐Villa, Tonatiuh; Ramírez‐Vidal, Lizbeth; Mendoza, Valentín; Escalante‐Alcalde, Diana; López‐Casillas, Fernando
- Abstract
Background: The Transforming Growth Factor β (TGFβ) family is a group of related proteins that signal through a type I and type II receptors. Betaglycan, also known as the type III receptor (Tgfbr3), is a coreceptor for various ligands of the TGFβ family that participates in heart, liver and kidney development as revealed by the tgfbr3‐null mouse, as well as in angiogenesis as revealed by Tgfbr3 downregulation in morphant zebrafish. Results: Here, we present CRISPR/Cas9‐derived zebrafish Tgfbr3‐null mutants, which exhibited unaltered embryonic angiogenesis and developed into fertile adults. One reproducible phenotype displayed by these Tgfbr3‐null mutants is delayed chordacentra mineralization, which nonetheless does not result in vertebral abnormalities in the adult fishes. We also report that the canonical TGFβ signaling pathway is needed for proper chordacentra mineralization and that Tgfbr3 absence decreases this signal in the notochordal cells responsible for this process. Conclusion: Betaglycan's "ligand presentation" function contributes to the optimal TGFβ signaling required for zebrafish chordacentra mineralization. Key Findings: Zebrafish betaglycan gene null mutants are viable and fertile without major obvious defects.Delayed chordocentra mineralization is a reproducible phenotype in these animals.This phenotype can be accounted for by a deficient TGF‐beta signaling in chordocentra, very likely due to the lack of betaglycan TGF‐beta presentation function.This is the first time this function is documented in vivo.
- Subjects
BRACHYDANIO; TRANSFORMING growth factors; MINERALIZATION; KIDNEY development
- Publication
Developmental Dynamics, 2022, Vol 251, Issue 1, p213
- ISSN
1058-8388
- Publication type
Article
- DOI
10.1002/dvdy.393